Hydraulic valve

ABSTRACT

Hydraulic valve with a valve chest ( 1 ) provided with a substantially cylindrical internal chamber ( 5 ) which may be closed by a valve disc ( 9 ) which with its conical rim ( 9 ′) engages the facial rim of the internal chamber ( 5 ), an insert member ( 3 ) being arranged in a section of the internal chamber ( 5 ) and structured as a member of sprocket-like cross-section with circular gaps ( 3 ″) between teeth forming valve passages ( 4 ) with the internal wall of the chest, the valve disc stem ( 6 ) permeating the insert member ( 3 ) being a one-piece structure and provided with a safety nut ( 7 ).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a hydraulic valve, in particular a pipe rupturevalve, provided with a valve chest having a substantially cylindricalinternal chamber which may be closed by a valve disc supported by acentral stem and biased into an open position by a valve springcircumscribing the stem and with an insert member arranged in theinternal chamber and provided with valve passages disposed adjacent eachother in a circular arrangement, with the valve disc stem permeating theinsert member and being provided with an adjustment head.

2. The Prior Art

British patent 556, 863 discloses a valve of this kind which is ofrelatively complex internal structure because its valve stem isstructured of multiple parts and because the components have to beassembled and connected with each other from the two ends of the valvechest. In addition, the valve disc closes by surface engagement with aconical internal chamber of the chest which entails the possibility ofimperfect closure. Finally, in the known valve the internal chamber mustbe machined from two sides for forming the cone and a section of theinternal chamber for receiving the insert member, this being timeconsuming and cost inefficient.

OBJECTS OF THE INVENTION

It is an object of the invention to overcome these drawbacks. The objectis accomplished in a valve of the kind referred to supra, by the conicalrim of a valve disc engaging a facial edge of the internal chamber andby the insert member being arranged in a section of the internal chamberand being structured as a member of sprocket-like cross-section providedwith circular gaps between its teeth which, with the interior surface ofthe chest, are forming valve passages, with the valve disc stempermeating the insert member being of single-piece constructionprovided, at the exterior surface of the valve disc, with an adjustablesafety nut, and by the end of the valve member opposite the valve discbeing provided, as is well-known, with an externally threaded sectionand an internal cone of the valve chamber for receiving a conicalcompression ring circumscribing a connection pipe and maintained inengagement with the internal cone by a nut threaded onto the threadedsection.

Preferably, the insert member is positioned in the section of theinternal chamber for axial movement relative to a snap ring.

It is a further object of the invention to provide an alternativehydraulic valve of the kind referred to supra which is characterized bythe conical rim of the valve disc engaging the facial rim of theinternal chamber of the chest and by the insert member being disposed ina section of the internal chamber for axial movement relative to a snapring and structured as a member of sprocket-like cross-section withcircular gaps between teeth forming, with the internal wall of thechest, valve passages, whereby the valve disc stem permeating the insertmember is provided with an adjustable safety nut.

By the simple structure in accordance with the invention consisting ofbut few components overall, processing or machining of the chest needonly be performed from one end in view of the fact that the valvepassages are formed in a separate insert member and, depending upongiven requirements, different insert members with passages of differentsizes may be used. Furthermore, a particular advantage of the structurein accordance with the invention is that if the insert member has axialplay, the insert member, when subjected to the pressure of fluid flowingfrom the pump, will be moved in the direction of the snap ring into anabutting position in which the cross-section of the valve bore isincreased.

A further object of the invention is a hydraulic valve of the kindreferred to supra with the characteristics of the conical rim of thevalve disc engaging the facial rim of the internal chamber of the chest,of the insert member being disposed with axial play in a section of theinternal chamber and formed as a member of sprocket-like cross-sectionwith circular gaps between teeth thereof forming valve passages with theinternal wall of the chest, the valve disc stem penetrating the insertmember being a single-piece structure and provided at the internalsurface of the insert member with an adjustable safety nut, and by theinsert member being in positive engagement with the internal wall of thechest and with the valve disc stem.

DESCRIPTION OF THE SEVERAL DRAWINGS

The novel features which are considered to be characteristic of theinvention are set forth with particularity in the appended claims. Theinvention itself, however, in respect of its structure, construction andlayout as well as manufacturing techniques, together with other objectsand advantages thereof, will be best understood from the followingdescription of preferred embodiments when read in connection with theappended drawings, in which:

FIG. 1 is an axial section of a valve in accordance with the invention;

FIG. 2 is an alternative embodiment;

FIG. 3 is a view in axial section of a second embodiment of theinvention;

FIG. 4 is an axial section along line IV—IV of FIG. 5;

FIG. 5 is a planar view of the insert member;

FIG. 6 is an axial section of a third embodiment; and

FIG. 7 is a section along line VII—VII of FIG. 6.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The pipe rupture valve shown has a cylindrical valve chest 1 forthreaded connection by an external thread section 2 at one end and anexternal thread section 2′ at the other end. In a valve insert member 3disposed in the internal chamber 5 of the chest, there are formedhydraulic medium passages 4 in a circular arrangement adjacent eachother. The valve insert member 3 is permeated by a screw threaded valvestem 6 which supports a valve disc 9 and which with a screw head 6′engages the side of the insert member 3 opposite the valve disc 9 andwhich is adjustably secured to the valve disc 9 by a safety nut 7. Thevalve stem 6 or the insert member 3 support a valve spring 8 whichterminates at the valve disc 9. In its idle position the valve disc 9 ispositioned at a predetermined spacing from the upper side of the chest 1and is provided with a conical closure rim 9′ for sealingly engaging,when impacted by pressure of the medium counteracting the compressionspring 8, the face rim 5′ of the internal chamber 5 as a result of aruptured pipe at the intake side of the valve (arrow P). The mediumpressure may originate, for instance, with a hydraulic lift cylinder(not shown).

An insert member 3 is retained within a section of the internal chamber5 of the chest by means of a snap ring 10. As shown in FIGS. 3 and 4,the shape of the valve insert member 3 is substantially cylindrical andsprocket-like cross-section with teeth 3′ and, between the teeth, gaps3″ of circular contour. The gaps 3″ and the internal wall of the chestform valve passages 4.

In accordance with FIG. 2, the insert 3 is provided with predeterminedaxial play A relative to the snap ring 10, so that when subjected toflow pressure in the direction of arrow P (from the pump) the insertengages the snap ring 10 thereby enlarging the flow cross-sectionbetween the rim 9′ of the valve disc and rim 5′.

In the embodiment shown in FIGS. 1 and 2, a pipe R is inserted in thelower end of the valve chest 1. At its exterior the pipe R is surroundedby a conical compression ring S which protrudes into an internal conicalsection 5′ of the valve bore 5. The pipe R and the compression ring Sare secured by a nut 11 seated on the thread 2′ of the valve chest 1.This construction prevents the escape of leaking oil from the valve byway of the thread 2′, for instance, as might occur if the valve chestwere screwed into a bore in the usual manner.

FIG. 5 depicts an embodiment of the valve in accordance with theinvention without any connected pipe, but with an insert member 3arranged with axial play.

FIGS. 6 and 7 depict a further embodiment of the invention, in which thevalve stem 6 permeating the insert member 3 is provided with the safetynut 7 at the internal face of the insert member 3. The central bore 3′″of the insert member 3 is provided with an axial rib 3 ^(iv) whichpenetrates into an axial groove 6′ of the valve stem shaft 6. At itsperiphery the insert member 3 is further provided with an axial rib 3Vwhich engages an axial groove 5″ of the internal wall of the chest. Inthis manner the insert member 3 is positively secured against rotation,and the valve may be adjusted without having to be disassembled.

1. A hydraulic valve, comprising: a valve chest forming a substantiallycylindrical internal chamber terminating at one end in a facial rim andat the other end with an externally threaded section and a conicalopening for receiving a compression ring surrounding a connecting piperetained in engagement with the conical opening by a nut threaded ontothe threaded section; a snap ring mounted coaxially in the chamber; avalve disc provided with a conical rim and mounted for movement relativeto the chamber between an open position in which the conical rim isremoved from the facial rim and a closed position in which the conicalrim engages the facial rim; a cylindrical insert member of substantiallysprocket-like cross-section for forming a plurality of valve passageswith the internal wall of the chamber permeated by the valve stem andmounted in the chamber for movement against and away from the snap ring;a valve stem for supporting the valve disc and permeating the insertmember; a safety nut provided on the valve stem at a face of the valvedisc opposite the chamber; and a valve spring circumscribing the stemfor biasing the valve disc into the open position thereof.
 2. Thehydraulic valve of claim 1, wherein the diameter of the insert membersubstantially equals the diameter of the chamber.
 3. The hydraulic valveof claim 2, wherein the valve passages are radial recesses ofsubstantially circular cross-section in the insert member open to theperiphery thereof and extending axially thereof.
 4. The hydraulic valveof claim 3, wherein the valve stem is of one-piece structure.
 5. Thehydraulic valve of claim 4, wherein one of the insert member and valvestem is provided with a radial protrusion and the other is provided withan axial groove for receiving the protrusion.
 6. The hydraulic valve ofclaim 5, wherein one of the insert member and the internal wall of thechamber is provided with a radial protrusion and the other is providedwith an axial groove for receiving the protrusion.